Optical illusions are a great way for psychology students to learn about perception! This activity really does make serious learning fun. It will keep ‘em busy and fascinated for a full class period or longer, depending on the level of the students and how much you do with it. If you like, you can just sit back and let the self-contained 8-page packet of interactive and informational mini-activities engage them on its own. Or, you can lead them through it, discussing each section as a group. (It is recommended to let them work on it in pairs.) The activity packet guides the students through a series of very cool illusions and other optical effects, which serve as examples of the various principles of human perception. The text-dependent questions that accompany each section require them to reflect upon the images and apply concepts as they go.